The Podkamennaya Tunguska (Russian: Подкаменная Тунгуска, literally Tunguska under the stones, also Middle Tunguska or Stony Tunguska) is a river in Krasnoyarsk Krai, Russia. It is an eastern tributary of the Yenisei and has a length of 1,160 miles (1,870 km). The name of the river comes from the fact that it flows under pebble fields without open water.[clarification needed] As early as 1610 Russians from Mangazeya had passed the Stony Tunguska's confluence with the Yenisei; by the 1620s Mangazeya Cossacks and trappers had ascended it seeking fur-tribute from the local Tungus clans.[1][2] The Tunguska event in June 1908 occurred near this river, some 8 km (5.0 mi) SSE of Lake Cheko.